Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Improvements to oxidation ponds well underway


Improvements to oxidation ponds well underway

Improvements to the oxidation ponds at the Christchurch Wastewater Treatment Plant are progressing steadily, with Pond 2 out of service while an earth wall is constructed to divide the pond in two.

The pond is also being deepened and reshaped, and its banks strengthened to reduce the potential for failure in a major earthquake.

Mike Bourke, the Council’s City Water and Waste Operations and Maintenance Manager says the upgrade will improve the pattern of flow through the pond.

“Construction of the dividing wall is well under way and the contractor will soon be stabilising this embankment to reduce the potential for wind blown sand to cause a nuisance.

“The contractor is flooding areas where deepening has been completed to again reduce the potential for sand to blow off the site,” says Mr Bourke.

Work is also being done on the pipe connections between the ponds. Part of this work will involve draining Pond 3, the small pond east of Dyers Road, to enable the construction of connecting pipe work.

“We’re taking this opportunity to deepen and reshape Pond 3, and to construct an island to enhance the wildlife habitat,” says Mr Bourke.

The upgrade of the ponds will change how the flow moves through the pond system and provide significant improvement to the wastewater quality before discharge.

Currently the flow passes through three ponds in series before it is discharged to the estuary. When the pond upgrade is completed in mid-2004 the flow will pass through seven ponds in series, and produce an effluent quality that is expected to be some 10 times better than the current discharge.

“This improved, natural disinfection is achieved by reducing the flow’s short circuit from the inlet to the outlet of each pond and maximising the time the flow takes to pass through all the ponds. Computer modelling of the pond system, coupled with salt tracer testing, has been used to predict the improvements and to determine the optimum shape and depth,” says Mr Bourke.

The first stage of the upgrade, which involved deepening and reshaping Pond 1, was completed in May this year.

Notes:

The upgrades to the oxidation ponds are linked to other upgrades around the city to improve the quality of treated wastewater, better protect the environment and ensure the entire wastewater system will cope with expected city growth, including:

treatment plant improvements; the major sewer upgrade - a $36 million, 10-year project which involves the laying of more than 30km of new pipe; the Ocean Outfall pipeline.

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

 

Wellington: Predator Free Capital Plan

Wellington City Council (WCC), the Greater Wellington Regional Council (GWRC) and NEXT Foundation, today announced a joint collaboration to make Wellington the first Predator Free capital city in the world. More>>

ALSO:

Gordon Campbell: On Judith Collins’ Efforts At Self Correction

Thousands of prisoners currently in prison may be entitled to an earlier release than expected – and compensation – because Corrections has incorrectly calculated their term of imprisonment. Unless of course, the government buries its mistakes by changing the law and retro-actively getting itself off the hook… More>>

ALSO:

More Justice & Corrections

Sector Opposes Bill: Local Government Bill Timeframe Extended

The Minister of Local Government Peseta Sam Lotu-Iiga has asked the Select Committee to extend the report back date for the Local Government Act 2002 Amendment Bill (No 2). More>>

ALSO:

Breed Laws Don’t Work: Vets On New National Dog Control Plan

It is pleasing therefore to see Louise Upston Associate Minister for Local Government calling for a comprehensive solution... However, relying on breed specific laws to manage dog aggression will not work. More>>

ALSO:

Not Waiting On Select Committee: Green Party Releases Medically-Assisted Dying Policy

“Adults with a terminal illness should have the right to choose a medically assisted death,” Green Party health spokesperson Kevin Hague said. “The Green Party does not support extending assisted dying to people who aren't terminally ill because we can’t be confident that this won't further marginalise the lives of people with disabilities." More>>

ALSO:

General Election Review: Changes To Electoral Act Introduced

More effective systems in polling places and earlier counting of advanced votes are on their way through proposed changes to our electoral laws, Justice Minister Amy Adams says. More>>

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news